How To Lower Data Rate On A Network On A 2Ghz Network On An Ipnet 2 (Net 2) On A Pnet 2 On A Router On A Gbnet 2.5 (Net 1) On An Uniden Network On
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1 Lab QoS Classification and Policing Using CAR Objective Scenario Step 1 This lab uses Committed Access Rate (CAR) to classify and police traffic. Although the classification and policing actions in this lab are configured on one router, this is not a requirement for CAR. CAR is commonly used to classify traffic at a distribution router and then police the traffic on congested core routers. Managing the bandwidth of the WAN link is difficult because the marketing departments in Singapore and San Jose frequently use peer-to-peer networking to exchange large graphics. When CAR is used to classify traffic, the DSCP value of the traffic can be lowered when excessive data rates occur. An analysis of current traffic patterns indicates that it is reasonable to allow up to 32 kbps of traffic between any two peers across the WAN link. All traffic up to the 32-kbps limit will be permitted with a best-effort DSCP value of 8. If the peers attempt to exchange data across the WAN link at rates exceeding 32 kbps, traffic will still be permitted to enter the network. However, the excessive traffic will be given a DSCP value of 0, which will rank it lower than best-effort status. On the WAN link, allow a maximum of 16 kbps of less than best-effort traffic with a DSCP value of 0. Any best-effort traffic that exceeds this bandwidth should be dropped. Build and configure the network according to the diagram. Before beginning a lab, the configurations on all the routers should be cleared and then reloaded or power cycled to reset their default 1-5 CCNP 3: Multilayer Switching v Lab Copyright 2005, Cisco Systems, Inc.
2 configurations. Delete the vlan.dat and startup configuration files on the switches before reloading them. Configure EIGRP with an AS of 100 as the routing protocol. The configuration of CAR will occur on the routers so the access-layer switches can be left in their factory-default configuration. Router(config)#hostname Singapore Singapore(config)#interface fastethernet 0/0 Singapore(config-if)#ip address Singapore(config-if)#no shutdown Singapore(config-if)#interface serial 0/0 Singapore(config-if)#ip address Singapore(config-if)#clock rate Singapore(config-if)#no shutdown Singapore(config-if)#router eigrp 100 Singapore(config-router)#network Singapore(config-router)#network Router(config)#hostname SanJose1 SanJose1(config)#interface fastethernet 0/0 SanJose1(config-if)#ip address SanJose1(config-if)#no shutdown SanJose1(config-if)#interface serial 0/0 SanJose1(config-if)#ip address SanJose1(config-if)#clock rate SanJose1(config-if)#no shutdown SanJose1(config-if)#router eigrp 100 SanJose1(config-router)#network SanJose1(config-router)#network Step 2 Step 3 On each router, use an access list to define the peers that will be subject to CAR. In this lab, each LAN network must be permitted access to the other. Singapore(config)#access-list 100 permit ip SanJose1(config)#access-list 100 permit ip Use the rate-limit command to classify the traffic on each router at the Fa0/0 interface. A partial syntax for the rate-limit command is as follows: Router(config-if)#rate-limit {input output} [dscp dscp value][accessgroup [rate-limit] acl-index] bps burst-normal burst-max conform-action action exceed-action action Mark conforming traffic of up to 32 kbps with a DSCP value of 8 and non-conforming traffic in excess of 32 kbps with a DSCP value of 0. The traffic will then be forwarded. Use question-marks (?) extensively in the following commands to become familiar with the different QoS options available. Singapore(config)#interface fastethernet 0/0 Singapore(config-if)# rate-limit input access-group conform-action set-dscp-transmit 8 exceed-action set-dscp-transmit 0 SanJose1(config)#interface fastethernet 0/0 2-5 CCNP 3: Multilayer Switching v Lab Copyright 2005, Cisco Systems, Inc.
3 SanJose1(config-if)#rate-limit input access-group conform-action set-dscp-transmit 8 exceed-action set-dscp-transmit 0 These commands will only mark the traffic using the DSCP. Both conforming and non-conforming traffic will be transmitted. Singapore#show interfaces rate-limit last packet: ms ago, current burst: 0 bytes last cleared 00:02:27 ago, conformed 0 bps, exceeded 0 bps Step 4 last packet: ms ago, current burst: 0 bytes last cleared 00:00:40 ago, conformed 0 bps, exceeded 0 bps On the outbound WAN interfaces, police the traffic according to the requirements of keeping less than best-effort traffic with a DSCP value of 0 to a maximum of 16 kbps. Police the traffic by dropping it if it is non conformant. SanJose1(config)#interface serial 0/0 SanJose1(config-if)# rate-limit output dscp conform-action transmit exceed-action drop Singapore(config)#interface serial 0/0 Singapore(config-if)#rate-limit output dscp conformaction transmit exceed-action drop Singapore#show interfaces rate-limit last packet: ms ago, current burst: 0 bytes last cleared 00:38:39 ago, conformed 0 bps, exceeded 0 bps params: bps, 1600 limit, 2000 extended limit conformed 0 packets, 0 bytes; action: transmit exceeded 0 packets, 0 bytes; action: drop last packet: ms ago, current burst: 0 bytes last cleared 00:13:29 ago, conformed 0 bps, exceeded 0 bps Singapore# 3-5 CCNP 3: Multilayer Switching v Lab Copyright 2005, Cisco Systems, Inc.
4 Step 5 last packet: ms ago, current burst: 0 bytes last cleared 00:34:27 ago, conformed 0 bps, exceeded 0 bps params: bps, 1600 limit, 2000 extended limit conformed 0 packets, 0 bytes; action: transmit exceeded 0 packets, 0 bytes; action: drop last packet: ms ago, current burst: 0 bytes last cleared 00:15:34 ago, conformed 0 bps, exceeded 0 bps Use an extended ping between LAN interfaces to test the traffic rate limiting policies. It may be helpful to experiment with ICMP packets that are different sizes. ping Protocol [ip]: Target IP address: Repeat count [5]: 20 Datagram size [100]: 1500 Timeout in seconds [2]: Extended commands [n]: y Source address or interface: Type of service [0]: Set DF bit in IP header? [no]: Validate reply data? [no]: Data pattern [0xABCD]: Loose, Strict, Record, Timestamp, Verbose[none]: Sweep range of sizes [n]: Type escape sequence to abort. Sending 20, 1500-byte ICMP Echos to , timeout is 2 seconds: Packet sent with a source address of !!.!!.!!.!!.!!.!!.!! Success rate is 70 percent (14/20), round-trip min/avg/max = 188/188/192 ms Step 6 The actions of CAR can be monitored by using the show interfaces rate-limit command to display the counters. Note that some of the 1500-byte packets exceeded the policed bandwidth on the WAN link and were dropped. last packet: ms ago, current burst: 0 bytes last cleared 00:00:44 ago, conformed 0 bps, exceeded 0 bps 4-5 CCNP 3: Multilayer Switching v Lab Copyright 2005, Cisco Systems, Inc.
5 params: bps, 1600 limit, 2000 extended limit conformed 14 packets, bytes; action: transmit exceeded 6 packets, 9024 bytes; action: drop last packet: 7304ms ago, current burst: 1120 bytes last cleared 00:00:46 ago, conformed 3000 bps, exceeded 1000 bps Congratulations, CAR has been configured to classify and police traffic. 5-5 CCNP 3: Multilayer Switching v Lab Copyright 2005, Cisco Systems, Inc.
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